In the (Formula) child property, type the expression for this column in the grid cell to the right. For example, ColumnA + ColumnB.

Indicate whether the data is persisted by choosing Yes or No from the drop-down for the Is Persisted child property.

Note:

If your Database Engine does not allow the persisting of expression results, you cannot choose Yes for the Is Persisted property.

The new computed column specification is assigned to the column in Table Designer after you click outside the grid cell or use the TAB key to move to another grid cell and changes are stored in the database when you save your changes in Table Designer.